Armature for dynamo-electric machines



(No Model.)

L. DAET.

ARMATURE FOR DY NAMO ELECTRIC MACHINES.

Patented Jan. 15,1889.

Jmramfcrr; V 2214 ZM UNITED STATES PATENT OFFICE.

LEO DAFT, OF PLAIXFTELD, NElV JERSEY.

ARMATURE FOR DYNAMO=ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 396,195. dated January15, 1889.

Application filed November 12, 1885. Renewed May 1, 1888. Serial No.272,855. 1N0 niodebl To all whom it may concern.-

Be it known that I, LEO DAFT, a subject of the Queen of Great Britain,and aresident of Plainfield, in the county of Union and State of NewJersey, have invented certain new and useful Improvements in Armatures,of which the following is a specification.

My invention relates to dynamo or magneto electric genera-tors ormotors; and it has for its object to improve the mechanical constructionof the armature-cores of such machines, so as to render them strong andfirm, and to furnish them with means for the rigid attachment of thespider-arms that support the core and to hold it in proper positionwhile under heavy strain, and at the same time permit the ready removalof the armature-shaft without disturbing the electrical connections.

To these ends my present invention consists of an armature-coreconstructed substantially as more particularly pointed out hereinafter.

Referring to the accompanying drawings, Figure 1 is an end view of acore, showing the outer ring and spider-arms. Fi 2 is a side view,partially in section. Fig. 3 is a similar view showing a modified coreor cylinder.

Great difficulty has been heretofore experienced in properly supportingthe core of armatures in machines used for heavy work, such as onelectric locomotives and the like, where the machine has to be startedand stopped frequently and is under great strain. Numerous attempts havebeen made to overcome these mechanical objections, and they have usuallyresulted in the use of large masses of magnetic material in and aroundthe core and windings, which is very objectionable, as the said materialtends to weaken the effect of such machines by the formation of theso-called Foucault currents, which not only waste the magnetic effect ofthe machines, but cause heating of the parts, which interferes with theproper operations of the machines.

It is usual to form the core or cylinder of some material, or in somearrangement of parts, so that the evils of these currents are overcome;and in the accompanying drawings Ihave shown thebodyof the core H inFig. 2 as made up of soft-iron wire and supported between the rings andin Fig. 53 the body H of the core is made up of soft-iron rings orwashers alternating with similar forms of insulating material and havingthe rings C at the ends. These rings C, I form of some diz'unagneticmaterial-such as phospln'irbronzeand these furnish an outer peripheralsurface of the core, which may be readily turned true to afford asuitable finindation for the coils of wire forming the armature.

It has been customary to support the core or cylinder uponSPltlQlf-Z'll'lllS attached directly to the peripheral rings 0 invarious ways; but I have lonnd Ihal a much stronger and satisfactorymeans of supporting the core in the construction shown in the drawings,and which I am about to describe.

Between the core ll and the ring C, I intcrpose a ring, A, composed of?phosphorbronze or other suitable material, preferably of a diameter tocorrespond to the periphery of the armatn re when the wires are applied,

and cast or formed integral with this ring are'the arms B 13, projectinglaterally therefrom. These arms fit in slots or recesses formed ormilled into the outer edge of the ring (1, and extend outward to thespider-ring D, which is mortised or recessed to receive the ends of thearms and to insure the proper centering of the armature-shalit uponwhich the spiders are secured. These arms are secured in place in therecesses by any suitable and well-known means.

From this construction it will be obvious that there is a strong andrigid connection between the spiders and the core without the use of anyscrews or bolts that will be liable to work loose and destroy or injurethe armature by grinding between the periphery of the armature and theinterior of the fieldmagnets, and that the parts of the armature will beheld in place and still maybe readily removed from its shaft withoutliability of disturbing the insulatiini of the windings thereon.

I claim 1. An armature consisting of a cylindrical core, rings connectedto the core and having out-wardly-extending arms, and spiders connectedto said arms, substantially as described.

2. The combination, with the core, of a termediate ring having integralarms, also of diamagnetic material, and spider-arms connected to theintermediate ring supporting the core, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses. I

LEO DAFT.

Witnesses:

J NO. N. BRUNs, F. HOLLY REED.

